Cycle life tests of High Power density cylindrical cells

Pajda said:
Noticed that Vapcell finally stocked the mass produced EVE 40PL, so I would order samples along with the 40P for tests. I'm thinking about ordering Lishen LR2170LA as well?
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One of my suppliers has also indicated the Samsung 58E is on the market (marked as CC5493F101), Queenbattery has it as well. QB also has EVE's 58E now.
 
To QueenBattery is the question if they are willing to send sample quantity, i.e. up to 10 pcs? I last ordered from them a couple of years ago and they wanted a min limit of about 100pcs or so.
 
Pajda said:
Btw. it seems that BAK also have already released its 58E model, and also launched its tabless "D" series in 21700 format. INR21700-40D and 45D should be in production and 50D model on the way.

So it looks like I'm going to be pretty busy in the near future :)

source: BAK Battery releases new generation 21700 full-lug series small power battery | LiFePO4 Battery or https://www.bakpowerproduct.com/category/33
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I believe currently this is still low-rate production but I could be wrong, I do have a box of 45D on their way.
Of course there is only so much that can be disclosed, but they have some even more exciting products coming soon

Edit: Actually, there is some news released already: Shenzhen seminar shares views on eVTOL aircraft industry

Pajda said:
To QueenBattery is the question if they are willing to send sample quantity, i.e. up to 10 pcs? I last ordered from them a couple of years ago and they wanted a min limit of about 100pcs or so.
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Hmm I see, I have not worked with them before. I can send you my supplier who has the Samsung 58Es right now, I can't 100% vouch for them but they've secured quality Molicel products for me in the past.
 
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thermal_runaway said:
Here's something interesting that came up recently, there is supposedly a couple new cells from Samsung earlier this year including the 21700 45T. It seems to just be a juiced up 40T based on the specifications.
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On this topic here are a couple more links that might have some useful tidbits of information:

alibaba listing that claims a cycle life of 800, to what capacity though is anybodies guess

german site that has apparently done discharge test

random other site which claims to also have them for sale


I also havent been able to find any info on the supposed 40v and 50vs...wonder when we'll see them start to pop up...
 
added small update in the third post (4500+ mAh graphs) for Samsung 50S and Molicel P50B. I added older results for 50S at 5C, so you can see that lowering discharge rate to 4C did not help much :(. On the other side P50B looks as mature product so far :)
 
Oh my, the Molicel P50B is worse than the EVE 40PL.

I was expecting a lot more NGL.
 
A 21700 tabless cell with SOP scheduled for 2025Q2: Tenpower's INR21700-40XG (4.0Ah)

1722959893017.png
1722959903037.png
P.S: There is also the INR21700-50SG and INR21700-50XG (tabless) in the Tenpower's 21700 roadmap, but as of today no further information has been made public about them yet. Apparently there's also a 46mm "Ultra Power" variant in the works:
1678157231111.jpg
 
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Are you looking for it? I hope this helps; I also have the EVE 40P charge-discharge graph curve here.
riba2233 said:
Thank you for the insight and trend looks really good so far! You are really doing a service to the community, thanks!

What do you think about the EVE 40P, it looks like they claim a bit higher current for the 4Ah size? They are not expensive, they could interesting if they have a good cycle life.
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Here is the full datasheet for the eve 40ps if anyone is interested, dont think it was posted before...am I the first one to find this? It is a later revision than the snippet posted above as well, Ive also attached some internal testing that eve has performed (pdf with lowercase "inr").
 

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  • INR21700_40P.pdf
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  • inr_21700-40p.pdf
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thebes said:
Here is the full datasheet for the eve 40ps if anyone is interested, dont think it was posted before...am I the first one to find this? It is a later revision than the snippet posted above as well, Ive also attached some internal testing that eve has performed (pdf with lowercase "inr").
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I'm always curious about these numbers.

If you utilize more complex charging algorithms and have active thermal management (heating+cooling), you're obviously going to get much better cycle life numbers, especially when fast charging.

Does that mean you get better warranty from the cell manufacturers?
 
BlueSwordM said:
Does that mean you get better warranty from the cell manufacturers?
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That sounds like a nightmare to manage, whichever manufacturer would have to probably go out and validate whatever system and determine 'oh the cells should last n cycles longer because of x, y and z' to be as fair as possible between clients. Doesnt seem to be very scalable especially when considering these manufacturers probably have thousands if not tens of thousands of clients, in the end it wouldnt yield more profits, as warranties never do, dont see much reason to implement a system like that, but thats just my guess, could be completely wrong lol 🤷‍♂️
 
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Here's another high power 21700 cell rated at 5Ah, 50A max. discharge current, with 12mΩ rated impedance:
the TerraE INR21700-50P. (TerraE is part of the BMZ Group, from Germany)
The cell's key facts can be found here. I'm attaching this document for posterity.
Here's an overview:
1723661305507.png
 

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  • TerraE_Key_Facts_INR_21700_50P_EN.pdf
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I setup a fundraiser on ko-fi for ES to get our knowledgebase built and it was really, really easy to get the money, as well as have people make the payments.

I'd be willing to throw a few bucks at such a thing.

BTW i'm noticing we have two of the same thread on the forum. Padja, are you OK with me merging them?
 
neptronix said:
BTW i'm noticing we have two of the same thread on the forum. Padja, are you OK with me merging them?
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Are they two of the same? Or are you seeing one for High Power cells, and one for High Energy?
 
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